Apparatus for reboring cylinders.



No. 663,373. Patented Dec. 4, I900.

J. A. WAHLGREN.

APPARATUS FOR REBORING CYLINDERS.

(Application filed. Jan. 25, 1900.)

(No Model.)

Usirrno STATES FFICE.

ATENT APPARATUS FOR REBORING CYLIND ERS.

SPECIFICATION forming part of Letters Patent No. 663,37 3, dated December 4, 1900.

Application filed January 25, 1900. Serial No. 2,798. (No model.)

To all whmn it may concern.-

Be it known that I, JOHN AUGUST WAHL- GREN, a citizen of the United States, residing at Vicksburg, in the county of Warren and State of Mississippi, have invented new and useful Improvements in Apparatus for Beboring Cylinders, of which the following is a specification.

My invention relates to metal-boring apparatus, and contemplates the provision of a simple, inexpensive, and easily-operated portable apparatus through the medium of which the cylinders of steam-engines may be expeditiously rebored to remove blow-holes therefrom without the necessity of removing them from their beds or supports.

With the foregoing end in mind the invention will be fully understood from the following description and claims, when taken in conjunction with the accompanying drawings, in which Figure 1 is a sectional view with some of the parts broken away, illustrating an enginecylinder on its bed or support and my improved apparatus in its proper operative position. Fig. 2 is a transverse section taken in the plane indicated by the broken line 2 2 of Fig. 1. Figs. 3 and 4 are detail sections taken in the planes indicated by the broken lines 3 3 and 4. 4, respectively, of Fig. 1. Figs. 5 and 6 are detail sections taken in the planes indicated by the broken lines 5 5 and 6 6, respectively, of Fig. 2. Fig. 7 is a detail plan View illustrating the gearing for transmitting motion from the cran k-shaft to the main shaft of the apparatus.

Referring by letter to the said drawings, A is a steam-engine cylinder from which the heads are removed, said cylinder being shown as arranged upon a bed or support B.

O is the shaft of my improved apparatus, and D D are gages through the medium of which said shaftis centered in the cylinder. These gages are arranged at either end of the cylinder and respectively comprise a body a, having a central bore 1) and radial arms 0 and adjusting-screws d, which extend through threaded apertures in lateral branches 6 of the arms and are adapted to bear against the outer side of'the cylinder at the inner sides of the flanges thereof afterthe manner shown. Through the medium of the said screws d the shaft 0, which extends through the central bores or apertures b of the gages, may obviously be placed in the longitudinal centers of cylinders of various sizes and securely held against casual lateral movement or displacement. The shaft O is provided with a longitudinal groove f to receive a spline g on a gear-wheel E, which is mounted on the shaft at the outer side of one of the gages, as shown. It is also provided at a suitable point with a cutter-head F. This cutter-head is fixed on the shaft by a set-screw h and carries suitable bits t', which are adjustably held in position by means of set-screws j and are designed to engage the wall of the cylinder after the manner shown in Figs. 1 and 2. The gear-wheel E is journaled and held by a collarj in a suitable support G, rising from a portable base G, so as to be held against movement in the direction of the length of the shaft 0, and in a support G rising from the same base, is journaled a shaft H, disposed at right angles to the shaft 0, the said shaft H having a crank it at its outer end and a pinion lat its inner end intermeshed with the gear-wheel E, as shown.

I is a swivel mounted on the forward end of the shaft 0 and secured in position by a collar 'm and nut n, and J is a weight which has for its purpose to draw the shaft and cutters forwardly as the reboringof the cylinder progresses. This weight is connected with the swivel I by a cable K, which takes over sheaves p, suspended from a ceiling or other support, and under a sheave q, connected by a cable 4" or other means to the floor, as shown.

In practice the heads of the cylinder to be rebored are removed and the swivel Iand the gageD adjacent thereto are removed from the shaft 0. Said shaft 0, with the cutter thereon, is then placed in the cylinder from one end thereof, after which the said gage D and the swivel I are replaced on the shaft, and the gages are fixed on the cylinder so as to center the shaft and hold it against casual lateral movement. With this done the shaft H is turned to rotate the shaft 0 and the cutter-head F, and as the cutting progresses saidshaft 0 is automatically drawn in the direction indicated by arrow by the gravitation of the weight J. Thisbperation is continued until the cutters are drawn from one end of the cylinder to the other and the reboring of the cylinder is completed, when the apparatus is removed and the cylinder-heads are replaced and secured in position.

It will be observed from the foregoing that my improved apparatus is adapted to be readily placed in its operative position with reference to a cylinder to be rebored without the necessity of removing the cylinder from its bed or support and is also adapted to be readily removed when the boring operation is completed. These will be appreciated as important advantages when it is remembered that the removal of a cylinder from its seat, the shipment thereof to and from a machineshop, and the resetting of the cylinder entail considerable expense.

It will also be observed from the foregoing that my improved apparatus is simple and durable and is susceptible of being readily transported from one point to another.

I have entered into a detail description of the construction and relative arrangement of the parts of my improved apparatus in order to impart a full, clear, and exact understanding of the same. I do not desire, however, to be understood as confining myself to such specific construction and arrangement of parts, as such changes or modifications may be made in practice as fairly fall within the scope of my invention.

Having thus described my invention, what I claim is- 1. A portable apparatus comprising gages provided with central bores, and also provided with means whereby they may be adj ustably fixed at the ends of a cylinder, a shaft journaled in the central bores of the gages and movable endwise through the same, means for rotating said shaft,a cutter fixed on and adapted to turn and move with the shaft, suitablysupported sheaves, a cable passed around said sheaves, a swivel connection between one end of the cable and the shaft, and a weight connected to the opposite end of the cable for drawing the shaft and cutter forwardly as the cutting progresses, substantially as specified 2. In a portable apparatus for reboring cylinders, the gages adapted to be arranged at either end of a cylinder and having central bores, and also having radially-disposed adjusting-screws for engaging the periphery of the cylinder, a shaft journaled in the central bores of the gages and having a longitudinal groove, the supports G G2 rising from a common, portable base, a gear-wheel mounted in the support G and having an aperture receiv ing the shaft, and a spline arranged in the groove ofsaid shaft, a shaft journaled in bearings on the support G and having a pinion at its inner end intermeshed with the gearwheel, and a crank at its outer end, suitablysupported sheaves, a cable passed around said sheaves, a swivel connection between one end of the cable and the shaft, a weight connected to the opposite end of the cable, and a cutter fixed on and adapted to turn and move with the shaft, substantially as specified.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN AUGUST WAHLGREN.

Witnesses:

JOHN I. NEWBURG, SoL BROWN. 

